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Recent Breaches › Cornerstone-BB Group Leaked Listed by ragnarlocker Ransomware Group

HIGH severityUnverified claimHow we verify

Cornerstone-BB Group Leaked Listed by ragnarlocker Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

RBRecent Breaches Breach Intelligence·December 14, 2020
Cornerstone-BB Group Leaked Listed by ragnarlocker Ransomware Group

Reported December 14, 2020.

HIGH
Severity
December 14, 2020
Disclosed
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The Cornerstone-BB Group Leaked Listed by ragnarlocker Ransomware Group (reported December 14, 2020) is an unverified claim; the data involved is undisclosed belonging to roughly unknown people. If you have an account with them, your information may now be circulating on the open web and with data brokers. Here’s exactly what happened, how to check if you were affected, and what to do next.

Severity & verification
HIGH severityUnverified claim
Data types not itemised.
Published on a ransomware group’s leak site — an unverified extortion claim until the named organization or credible reporting corroborates it.
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On December 14, 2020, the ransomware group ragnarlocker listed an entity called Cornerstone-BB Group Leaked on its data-leak site. The listing states that internal files were taken during a ransomware operation. The incident is notable because it involves the public posting of stolen corporate material, a tactic that can extend pressure on the targeted organization beyond the initial encryption of systems.

Inside the incident

The only confirmed information is the appearance of the listing on the group's site on the reported date. Details such as the number of records involved, the precise method of intrusion, and whether any data was subsequently released remain undisclosed in public reporting.

Who is ragnarlocker?

Ragnarlocker is a ransomware operation that has been active in targeting businesses. The group typically uses encryption combined with the threat of releasing stolen data to encourage payment. It has been linked to several prior incidents involving corporate networks.

Who is Cornerstone-BB Group Leaked?

Cornerstone-BB Group Leaked appears to be a corporate organization. Entities of this type commonly maintain records related to clients, employees, and internal operations. A breach affecting such an organization can involve sensitive business information.

What was likely exposed

The real-world impact

Individuals whose information appears in the internal files may face risks of identity misuse or targeted scams. For the organization, the exposure can lead to operational disruption and loss of trust from clients and partners.

If your data was in this claimed breach

Anyone concerned about possible exposure should monitor their financial and online accounts for unusual activity and consider enabling additional authentication measures. Readers can run a free exposure scan of their email to check whether their information has surfaced in known breach data.

AICompiled with AI assistance from public sources and published under our editorial standards.

Editorial & sourcing policy
Recent Breaches is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data, and we do not hold the data claimed in leak-site listings. Incidents are compiled from publicly accessible sources and threat-intelligence platforms and are reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — write to support@galaxywarden.com or press@recentbreaches.com.
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How this breach connects

Company

Attributed to

Method

CompanyCornerstone-BB Group Leaked security record
88/100
DoxxScan™ · Low doxx risk
B 83Good record

1 reported incident on record.

See Cornerstone-BB Group Leaked’s full breach history →

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Read GalaxyWarden’s full analysis of the Cornerstone-BB Group Leaked Listed by ragnarlocker Ransomware Group →

Source: threat-actor leak-site listing

Publicly posted by ragnarlocker — unverified claim, pending independent verification

Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated assessment, not a definitive rating. Verification status is shown where available.

Attributions to threat groups and methods reflect public reporting and, in some cases, unverified claims made by the groups themselves; they may be incomplete or later revised. Recent Breaches and GalaxyWarden are independent and are not affiliated with, and do not endorse, any company or group named on this page. This information is aggregated from public sources for awareness only and is not legal, security, or investment advice.

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